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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Contributed Surplus [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive loss associated companies [Member]
Retained Earnings [Member]
Balance, at beginning of year at Dec. 31, 2012 $ 994,768 $ 85,225 $ 144,258 $ 561,372 $ (79,421) $ (5,176) $ 288,510
Balance, at beginning of year (in shares) at Dec. 31, 2012 85,225,000 85,225,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued (in shares) 8,035,000 8,035,000          
Shares issued 128,915 8,035 120,880        
Payments in lieu of issuing shares for exercised share options (448)   (448)        
Amortization of stock based compensation 140   140        
Equity component of convertible bond issuance, net 20,722   20,722        
Amortization of deferred equity contributions 6,385     6,385      
Loss on hedging financial instruments reclassified into earnings 502       502    
Fair value adjustments to hedging financial instruments 37,036       32,908 4,128  
Fair value adjustments to available for sale securities 218       218    
Other items of comprehensive (loss)/income (68)       (68)    
Net income 57,442           57,442
Dividends declared (36,371)           (36,371)
Balance, at end of year at Jun. 30, 2013 1,209,241 93,260 285,552 567,757 (45,861) (1,048) 309,581
Balance, at end of year (in shares) at Jun. 30, 2013 93,260,000 93,260,000          
Balance, at beginning of year at Dec. 31, 2012 994,768 85,225 144,258 561,372 (79,421) (5,176) 288,510
Balance, at beginning of year (in shares) at Dec. 31, 2012 85,225,000 85,225,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued (in shares) 8,035,000 8,035,000          
Shares issued 128,915 8,035 120,880        
Payments in lieu of issuing shares for exercised share options (448)   (448)        
Amortization of stock based compensation 220   220        
Equity component of convertible bond issuance, net 20,722   20,722        
Amortization of deferred equity contributions 20,197     20,197      
Loss on hedging financial instruments reclassified into earnings 2,102       2,102    
Fair value adjustments to hedging financial instruments 44,724       41,827 2,897  
Fair value adjustments to available for sale securities 699       699    
Other items of comprehensive (loss)/income (58)       (58)    
Net income 89,206           89,206
Dividends declared (109,114)           (109,114)
Balance, at end of year at Dec. 31, 2013 1,191,933 93,260 285,632 581,569 (34,851) (2,279) 268,602
Balance, at end of year (in shares) at Dec. 31, 2013 93,260,000 93,260,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued (in shares) 99,000 99,000          
Shares issued 463 99 364        
Payments in lieu of issuing shares for exercised share options (1,196)   (1,196)        
Amortization of stock based compensation 29   29        
Equity component of convertible bond issuance, net 0   0        
Amortization of deferred equity contributions 2,319     2,319      
Loss on hedging financial instruments reclassified into earnings 5,196       5,196    
Fair value adjustments to hedging financial instruments (9,909)       (8,996) (913)  
Fair value adjustments to available for sale securities (346)       (346)    
Other items of comprehensive (loss)/income 3       3    
Net income 63,092           63,092
Dividends declared (75,562)           (75,562)
Balance, at end of year at Jun. 30, 2014 $ 1,176,022 $ 93,359 $ 284,829 $ 583,888 $ (38,994) $ (3,192) $ 256,132
Balance, at end of year (in shares) at Jun. 30, 2014 93,359,000 93,359,000